期刊
MAGNETIC RESONANCE IN MEDICINE
卷 58, 期 1, 页码 200-205出版社
JOHN WILEY & SONS INC
DOI: 10.1002/mrm.21254
关键词
k-space; trajectory measurement; gradient characterization; rapid imaging; spiral
Various techniques for k-space trajectory measurement have been described in the literature. Self-encoding gradient techniques are time-consuming due to the high number of phase-encoding steps needed. The approach with localized slices is faster, but its use apparently has not been reported in the context of high spatial resolution experiments. Signals associated with high k-space frequencies may then reach low or even zero values, and this may result in errors in the estimate of the trajectories at the k-space periphery. To overcome this problem without increasing the measurement duration of the localized slice method too much, a new approach is proposed in which an addition dephasing gradient applied prior to the gradient to be measured shifts the signal maximum. Magn Reson Med 58: 200-205, 2007. (c) 2007 Wiley-Liss, Inc.
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